JP2004161108A - Air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioner which can reduce the emission of noises. <P>SOLUTION: According to the air conditioner, a refrigerant is sent from an evaporator 4 to a compressor, form which the refrigerant is further compression-transferred to a condenser via a conduit to be circulated, while air A taken in from an intake 33 is cooled by the evaporator 4 and is sent to a prescribed area. An cylindrical air-guide pipe 30 is arranged on the intake 33, and a muffler 20 is set to be counter to the evaporator 4 inside the air-guide pipe 30. The muffler 20 has a plurality of laminated plates 23 each comprising a reflective member 22 and a sound absorbing member 21 in layers, and an airflow passage 31, through which the air A flows, is formed between the outer periphery of respective laminated plates 23 and the air-guide pipe 30. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an air conditioner.
[0002]
[Prior art]
[0003]
[Patent Document 1]
JP 2001-317759 A
BACKGROUND OF THE INVENTION
BACKGROUND ART Conventionally, an air conditioner has been known in which a refrigerant is pressure-fed from an evaporator to a condenser through a conduit by a compressor, and air cooled around the evaporator is blown (for example, Patent Document 1). As one type of such an air conditioner, an air conditioner called a spot cooler that cools air taken in from an intake port by an evaporator and blows the air to a predetermined area is used.
By the way, in recent years, low noise of various industrial equipment has been regarded as important, and also in this type of air conditioner, reduction of noise is important.
In such an air conditioner, the main cause of the noise is that noise in the device leaks from an air intake.
[0005]
Therefore, an object of the present invention is to provide an air conditioner that can reduce the generation of noise.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, an air conditioner according to the present invention circulates the refrigerant by pumping the refrigerant to a condenser by a compressor from an evaporator via a conduit, and circulates the air taken from an intake port into the evaporator. In an air conditioner that cools and blows air to a predetermined area, a cylindrical air guide tube is provided at the intake port, and a muffler is provided inside the air guide tube so as to face the evaporator, The noise reduction device has a plurality of laminated plates in which a reflective member and a sound absorbing member are laminated, and a ventilation path through which air flows is formed between an outer periphery of each of the laminated plates and the air guide tube. The laminate is provided so as to be substantially perpendicular to the flow of air flowing from the intake port to the evaporator, and to be separated from each other in the flow direction of the air and to face each other. The sound absorbing member faces the evaporator so that the sound absorbing member faces the outside of the mouth. So that each of the laminated plates is arranged, and the plurality of laminated plates have a smaller area as going downstream along the flow direction of the air, and the plurality of laminated plates are arranged between the laminated plate and the air guide tube. The blower path is characterized in that the flow path cross-sectional area increases as it goes downstream.
[0007]
By the way, when a sound wave is incident from a propagation material such as air on a boundary surface of a member different from the propagation material, a reflection or transmission phenomenon occurs.
Due to the transmission, the sound wave propagates through the member and is converted into thermal energy to be absorbed. Therefore, as the “sound absorbing member”, it is preferable to use a porous material such as urethane foam, glass wool, or the like, which has a large sound absorbing effect.
On the other hand, a substance having a higher specific gravity has a greater effect of reflecting and blocking sound waves. Therefore, it is preferable to use, for example, a stainless metal plate in consideration of workability, durability, and the like, as the “reflecting member”.
[0008]
On the other hand, an air conditioner according to the present invention circulates the refrigerant by pumping the refrigerant to the condenser by a compressor from the evaporator via a conduit, cools the outside air taken in from the intake port by the evaporator, In an air conditioner that blows air to a region, a tubular air guide tube is provided at the intake port, and a silencer is provided inside the wind guide tube so as to face the evaporator, and the silencer includes a plurality of passages. Having a perforated plate having holes, each of the perforated plates so as to be substantially orthogonal to the flow of air flowing from the intake port to the evaporator, and to face each other in the direction of flow of the air. The muffler is formed by the through holes and the plate portions, which are provided in parallel, and the passage holes of the respective perforated plates face the plate portions of the adjacent perforated plates facing each other. It is characterized by the following.
[0009]
According to the present invention, since the air guide tube is provided in the opening and the silencer is provided inside the air guide tube, it is possible to prevent noise in the device from leaking to the outside.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First, a cooling system using the general air conditioner will be briefly described.
Cooling system:
FIG. 1 shows a schematic configuration diagram of a general air conditioner.
As shown in FIG. 1, the compressor 3 sends the refrigerant gasified in the evaporator 4 to the condenser 6 via the conduit 5, further sends the refrigerant from the condenser 6 to the expansion valve 7, and circulates the refrigerant. Let it. At this time, the refrigerant gradually liquefies in the condenser 6 and the expansion valve 7. The expansion valve 7 is formed of an extremely thin tube shown by a broken line. The refrigerant exits the expansion valve 7, has a low pressure in a relatively thick pipe in the evaporator 4, and vaporizes again, thereby removing heat around the evaporator 4 and lowering the ambient temperature.
[0011]
The housing 1 is partitioned by a partition wall 2 into a first chamber 9 and a second chamber 10. The first chamber 9 houses the evaporator 4 and the first fan 11. On the other hand, the second chamber 10 houses the compressor 3, the condenser 6, and the second fan 12.
[0012]
Therefore, outside air is taken into the first chamber 9 from the intake hole by the first fan 11 and passes through the evaporator 4, the outside air is cooled by the evaporator 4, and cool air is sent out of the housing 1. Is done. On the other hand, in the condenser 6 provided in the second chamber 10, the refrigerant is compressed to a high temperature, whereas the outside air is passed through the condenser 6 by the second fan 12 to lower the temperature of the refrigerant. ing.
[0013]
FIG. 1 is a schematic configuration diagram of a general air conditioner to the last, and does not limit the arrangement of each device and the like. For example, the first chamber 9 may be located above or below the second champer 10. Further, it is not always necessary to have the partition wall 2, and in such a case, one fan for taking in outside air may be used.
[0014]
Next, the main part of the present invention will be described.
In the following description, an example in which the present invention is applied to a spot cooler that blows cool air to a predetermined area will be described.
First embodiment:
2 and 3 show a first embodiment.
FIG. 2 is a schematic sectional view showing the vicinity of the evaporator 4. As shown in FIG. 2, a fan 13, an evaporator 4, a baffle 30, and a muffler 20 are provided in the housing 1. The air guide tube 30 is provided in an outside air intake port (an example of an opening) 33 formed in the housing 1, and an end on the internal I side is close to or connected to the evaporator 4. On the other hand, a blower tube 15 extending from the inside I of the housing 1 to the outside O is connected to the fan 13. A negative pressure is generated in the housing 1 by the rotation of the fan 13, and the outside air A is taken into the inside I of the housing 1 from the intake port 33. The outside air A is cooled by the evaporator (an example of a device serving as a noise source) 4 and then sent out of the housing 1 through the blower tube 15.
[0015]
Silencer 20:
By the way, noise in the housing 1 whose main sound source is the fan 13 and the like leaks from the intake 33 to the outside O. The silencer 20 shown in FIG. 3A is for preventing noise in the interior I of the housing 1 from leaking from the intake 33 to the outside O. Is provided. The silencer 20 is provided on the outside O side of the baffle 30 and is fixed so as to face the evaporator 4 provided at the end on the I side of the baffle 30.
[0016]
A plurality of laminated plates 23 are fixed to the air guide tube 30 via the support members 25 (FIG. 3B) in the air guide tube 30. As shown in FIG. 3B, the outline of the front surface of the laminated plate 23 viewed from the air flow direction A is substantially similar to the vertical cross section of the air guide tube 30 indicated by a two-dot chain line. . As shown in FIG. 3A, an air passage 31 through which air flows is formed between the outer periphery of each laminated plate 23 and the inner peripheral surface of the air guide tube 30. Each of the laminated plates 23 is provided so as to be orthogonal to the flow A of the air flowing from the intake port 33 to the evaporator 4 and to be separated from each other in the flow direction A of the air and to face each other. The air A taken in from the inlet 33 is sent to the evaporator 4 through the air passage 31.
[0017]
The laminate 23 includes a first sound absorbing member 21 and a reflecting member 22. The first sound absorbing member 21 is formed of, for example, a porous material having a high sound absorbing effect, such as urethane foam. On the other hand, the reflection member 22 is formed of, for example, a material having a high sound reflection effect such as stainless steel. The first sound absorbing member 21 is laminated by being attached to the reflecting member 22 using an adhesive or the like.
The first sound absorbing member 21 is provided so as to face the evaporator 4, and the reflecting member 22 is provided outward so as to face the outside O of the intake port 33.
[0018]
Noise in the housing 1 mainly caused by the rotation noise of the fan 13 is first absorbed by the first sound absorbing member 21, then reflected by the reflecting member 22, and then again absorbed by the first sound absorbing member 21. You. In addition, the noise toward the external O is reflected by the reflection member 22, so that a sound insulation effect of blocking the noise toward the external O can be obtained. Therefore, noise leaking to the outside O of the housing 1 can be significantly reduced.
Further, by providing the sound absorbing member 21, it is possible to prevent the reverberation of the noise, so that it is possible to reduce the vibration noise caused by the reverberation.
Furthermore, since a plurality of laminated boards 23 are provided, the above-described sound absorption and reflection are performed by each laminated board 23, so that noise can be further reduced.
[0019]
Further, since the muffler 20 is provided in the air guide tube 30 in the housing 1, noise can be reduced without increasing the size of the air conditioner.
[0020]
As shown in FIG. 3B, the laminated plate 23 is arranged in a cone shape that tapers as it approaches the evaporator 4. That is, the plurality of laminated plates 23 have a smaller area as going downstream along the air flow direction A. Therefore, the cross-sectional area of the air passage 31 increases toward the downstream, so that the air in the air passage 31 can smoothly flow and uniformly apply air to the side surface of the evaporator 4. it can. Therefore, noise can be prevented without lowering the performance of the air conditioner.
[0021]
By the way, on each outer peripheral edge of the reflection member 22, a slanted edge 23 e inclined toward the downstream as the air guide tube 30 is approached is formed. That is, the laminated plate 23 is formed in a dish-like shape whose outer peripheral edge 23e is inclined toward the evaporator 4 (FIG. 3A). The inclined edge 23e is for preventing turbulence near the outer periphery of the laminated plate 23. The inclined edge 23e allows the air in the air passage 31 to flow more efficiently.
Note that the outermost laminated plate 23 may be formed in a spherical shell shape (arc-shaped cross section) by bulging the surface on which the air A hits outward, so that the fluid flows smoothly.
[0022]
Second sound absorbing member 32:
A second sound absorbing member 32 is adhered to the inner peripheral surface of the wind guide cylinder 30. The second sound absorbing member 32 may be made of the same material as the first sound absorbing member 21. As the second sound absorbing member 32, for example, a porous material such as urethane foam or glass wool can be used. .
By providing the second sound absorbing member 32 in the air guide tube 30, the noise in the air guide tube 30 can be absorbed and reflected, so that the noise can be further reduced.
[0023]
In addition, in the said 1st Embodiment, although the cross-sectional shape of the baffle tube 30 was square, the cross-sectional shape of this baffle tube may be various shapes, such as a circle, for example. In such a case, in order to make the flow of air smooth, it is preferable to form the outline of the front surface of the laminated plate 23 to be substantially similar to the cross-sectional shape of the air guide tube.
Further, the air guide tube 30 is preferably provided so as to be substantially continuous from the intake port 33 to the evaporator 4 in order to send the air A uniformly (without deviation) to the evaporator 4.
[0024]
Second embodiment:
Next, a second embodiment will be described. The air conditioner according to the second embodiment includes a fan 13, an evaporator 4, a baffle 30 and a muffler 20B in a housing 1 shown in FIG. The air guide tube 30 is provided in an outside air intake 33 formed in the housing 1, and an end on the internal I side is close to or connected to the evaporator 4. On the other hand, a blower cylinder 15 extending from the inside I of the housing 1 to the outside O is connected to the fan 13. A negative pressure is generated in the housing 1 by the rotation of the fan 13, and the outside air A is taken into the inside I of the housing 1 from the intake port 33. After being cooled by the evaporator 4, the outside air A is sent out of the housing 1 through the blower tube 15.
[0025]
Silencer 20B:
The silencer 20B shown in FIG. 4A is for preventing noise in the interior I of the housing 1 from leaking from the intake 33 to the outside O. Is provided. The silencer 20B is provided on the outside O side of the baffle 30 and is fixed so as to face the evaporator 4 provided at the end on the inside I side of the baffle 30.
[0026]
A plurality of perforated plates 40 are fixed in the air guide tube 30. Each perforated plate 40 is formed of a member having a high sound reflection effect, such as a stainless metal plate, and covers the entire inner peripheral surface of the air guide tube 30 so as to block the inside of the air guide tube 30. Fixed to. The perforated plate 40 is provided so as to be substantially orthogonal to the flow A of the air flowing from the intake port 33 to the evaporator 4 and to be separated from each other in the flow direction A of the air so as to face each other. ing.
[0027]
As shown in FIG. 4B, the perforated plate 40 is formed by perforating a plurality of passage holes 41 in a plate portion 42. The passage hole 41 is formed, for example, horizontally long in the width direction Y of the perforated plate 40.
As shown in FIG. 4A, the passage holes 41 of each of the perforated plates 40 are respectively set so as to face the plate portions 42 of the adjacent perforated plates 40 facing each other. Therefore, the silencer 20B forms a maze structure (labyrinth) by each of the passage holes 41 and the plate portion 42. Therefore, the noise passing through the passage hole 41 is reflected by the plate portion 42, and is attenuated by repeating the passage and reflection between the perforated plates 40, thereby greatly reducing the noise leaking from the intake port 33. Can be reduced.
[0028]
The shape of the passage hole 41 is horizontally long in the width direction Y of the perforated plate 40. However, any shape may be used as long as the labyrinth structure is formed with the facing plate portion 42 of the perforated plate 40. Any shape such as a circle, an ellipse, a square, an L-shape, and a U-shape may be used.
[0029]
Further, as in the sound deadening device 20C shown in FIG. 5, a third sound absorbing member 43 made of a material having a high sound absorbing effect, such as urethane foam, may be attached to the evaporator 4 side of each of the perforated plates 40, for example. Good. The third sound absorbing member 43 absorbs the noise in the air guide tube 30 and reduces the vibration of each perforated plate 40 due to the reflection of the noise, so that the noise leaking from the intake 33 is further reduced. Can be.
[0030]
In the present invention, in addition to the evaporator, a fan motor or a compressor may be considered as a noise source, and a silencer may be provided to face these devices. Further, a muffling device may be provided in an opening other than the air intake, from which a sound is emitted.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a general air conditioner according to the present invention.
FIG. 2 is a partial cross-sectional view of the air conditioner according to the first embodiment of the present invention.
FIG. 3A is a partial sectional view showing the vicinity of an evaporator, and FIG. 3B is a schematic perspective view of a muffler.
FIG. 4A is a partial cross-sectional view showing the vicinity of an evaporator according to a second embodiment of the present invention, and FIG. 4B is a schematic perspective view of the muffler.
FIG. 5 is a partial cross-sectional view showing the vicinity of an evaporator showing a modification.
[Explanation of symbols]
1: Housing 3: Compressor 4: Evaporator 5: Conduit 6: Condenser 20: Silencer 21: First sound absorbing member 22: Reflecting member 23: Laminated plate 23e: Inclined edge 30: Wind guide tube 31: Blow Road 32: second sound absorbing member 33: intake (opening)
40: perforated plate 41: passage hole 42: plate portion

Claims (6)

In an air conditioner that circulates the refrigerant by pumping the refrigerant to a condenser by a compressor through a conduit from an evaporator, cooling the air with an evaporator and blowing it to a predetermined area,
A tubular air guide tube is provided in the opening,
A silencer is provided inside the wind guide tube so as to face the noise source,
The noise reduction device has a plurality of laminated plates in which a reflection member and a sound absorption member are laminated,
An airflow path through which air flows is formed between the periphery of each of the laminated plates and the air guide tube,
Each of the laminated plates is provided so as to be substantially perpendicular to the flow of air flowing from the opening to the noise source, and to be separated from each other in the flow direction of the air and face each other,
Each of the laminates is arranged such that the reflection member faces outward of the opening, and the sound absorbing member faces the noise source.
The plurality of laminated plates have a smaller area as going downstream along the flow direction of the air, and the air passage between the laminated plate and the air guide tube has a flow path cross-sectional area as going downstream. An air conditioner that is set to be larger. In claim 1,
The air conditioner, wherein the muffler has a configuration in which the respective laminates are arranged in a cone shape that tapers as approaching the noise source. In claim 1,
An air conditioner in which each outer peripheral edge of the reflection plate forms a slanted edge that is inclined downstream as approaching the air guide tube. In claim 1,
An air conditioner in which a sound absorbing member is provided on an inner peripheral surface of the wind guide cylinder. In claim 1,
An air conditioner, wherein the air guide tube is substantially continuous from the opening to the noise source. In an air conditioner that circulates the refrigerant by pumping the refrigerant to a condenser by a compressor through a conduit from an evaporator, cooling the air with an evaporator and blowing it to a predetermined area,
A tubular air guide tube is provided in the opening,
A silencer is provided inside the wind guide tube so as to face the noise source,
The muffler has a perforated plate having a plurality of passage holes,
Each of the perforated plates is provided so as to be substantially perpendicular to the flow of air flowing from the opening to the noise source, and to be parallel to each other so as to be spaced apart from each other in the flow direction of the air.
An air conditioner in which the muffler forms a maze structure between each of the passing holes and the plate portion, since the passage holes of each of the perforated plates face the plate portions of the adjacent perforated plates facing each other.

Images